A 17-year-old boy has been arrested on suspicion of drink and drug driving offences after a crash which left a passenger seriously injured.
It was reportedly three vehicles were involved including a black Nissan Qashqai on Dunkirk Road at around 1.40pm.
A passenger in the Nissan suffered potentially serious injuries.
A 17-year-old boy was arrested on suspicion of causing serious injury by dangerous driving and drug driving.
He has since been released under investigation.
An Essex Police spokesman said: "We need anyone who saw what happened to come forward and we are particularly interested to speak to anyone who saw how the Nissan was being driven.
"If you have any information, CCTV, dash cam or other footage in relation to this incident, then please get in contact with us.
"Please quote incident 692 of May 4.
"You can let us know by submitting a report on our website or by using our online Live Chat service which is available 24 hours-a-day, seven days-a-week.
"Visit www.essex.police.uk/digital101 to find out more about our online reporting services.
"If you would like to make an anonymous report you can contact independent charity Crimestoppers, by visiting their website or by calling 0800 555 111."
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